Most big batteries store electricity, discharging it as needed, and revolutionizing power grids, and an era of electric vehicles. This stores large amounts of blistering heat, drawing surplus electricity from nearby wind farms, otherwise wasted, using it to heat carbon blocks to as much as 4,352 degrees Fahrenheit which stay hot for days, then releasing heat on demand to produce steam for a nearby biofuel refinery, replacing need to burn natural gas and coal.
www.nytimes.com/2026/10/29/climate/heat-battery-thermal-energy-storage.html